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21 July in military history: the First Battle of Bull Run, 1861

Military history · 21 July · American Civil War · Full calendar

Pencil and white wash drawing on green-gray paper: Union infantry with two flags stand massed on the left, mounted officers ride forward waving their hats, wounded men lie and are tended in the grass, and long lines of troops and clouds of gunsmoke rise along a ridge in the background.
Colonel Burnside's brigade at Bull Run, 21 July 1861: a drawing made in 1861 by the special artist Alfred R. Waud. Public domain. Library of Congress, via Wikimedia Commons.
Quick answer

On 21 July 1861 the Union army of Brigadier General Irvin McDowell attacked the Confederates of Generals P.G.T. Beauregard and Joseph E. Johnston along Bull Run, near the railroad junction at Manassas in northern Virginia. A morning flank attack drove the Confederates back, but they rallied on Henry Hill, where Thomas J. Jackson earned the name Stonewall. Late in the afternoon Confederate reinforcements broke the Union right, and the retreat turned into a rout. It was the first major land battle of the Civil War, and it showed both sides that the war would be long.

On to Richmond

Fort Sumter had fallen in April, but the war had not yet been fought in earnest. Under public pressure for a quick end, President Abraham Lincoln pushed McDowell to advance on the Confederate capital at Richmond. On 16 July McDowell marched out of Washington with about 35,000 men, most of them short-term volunteers with little training. Their target was Manassas Junction, where the railroad from the Shenandoah Valley met the line to Richmond.1

Beauregard held the fords of Bull Run with about 22,000 men, according to the National Park Service. Johnston's army in the Shenandoah Valley slipped away from the Union force watching it and came east by rail, most of it arriving on 20 and 21 July. The National Park Service battle summary puts the troops engaged at 28,450 Union and 32,230 Confederate, and the American Battlefield Trust gives the same figures.2

Matthews Hill and Henry Hill

McDowell's plan was to make a show at the Stone Bridge while two divisions marched around the Confederate left and crossed Bull Run at Sudley Ford. The march was slow, and a Confederate signal officer, E. P. Alexander, spotted the column and warned Colonel Nathan Evans at the bridge by signal flag: look out for your left, you are turned. Evans shifted his brigade to meet it, and from about 10 a.m. the two sides fought on Matthews Hill until the outnumbered Confederates gave way.3

The beaten brigades rallied on Henry Hill, around the house of the widow Judith Henry, where Jackson's Virginia brigade had formed behind a line of guns. During the fighting there Brigadier General Barnard Bee pointed to Jackson's men standing firm, and from then on Jackson was known as Stonewall; Bee himself was killed. McDowell pushed two Union batteries forward onto the hill, close to the Confederate guns. Shells fired at the Henry house mortally wounded Judith Henry, and the batteries were captured and recaptured as the fight swayed back and forth around them.4

The rout

Late in the afternoon fresh Confederate brigades, one of them brought by rail from the Shenandoah Valley, extended the line and struck the Union right on Chinn Ridge. The Union withdrawal began in order but turned into a rout when the retreating soldiers met the road to Washington jammed with the carriages of congressmen and other civilians who had come out to watch the battle. Confederate President Jefferson Davis reached the field as the fighting ended, but his army was too disorganized to pursue. By 22 July the beaten Union army was back behind the defenses of Washington.5

Casualty estimates differ. The National Park Service battle summary gives 2,950 Union and 1,750 Confederate casualties; the American Battlefield Trust gives 2,896 Union and 1,982 Confederate.6

The battle convinced the Lincoln administration that the war would be long and costly. Ninety days of service was clearly not enough, and Congress expanded the army and lengthened enlistments. McDowell was replaced by Major General George B. McClellan, who set about reorganizing and training the troops. The full story of the battle is in our article on the First Battle of Bull Run.7

Also on this day

Frequently asked questions

Who won the First Battle of Bull Run?

The Confederates under Beauregard and Johnston. The Union army under McDowell was driven from the field and fled back to Washington, but the victors were too disorganized to pursue.

Why is it called both Bull Run and Manassas?

Bull Run is the stream along which the battle was fought, and Manassas is the nearby railroad junction both armies were fighting over.

How did Stonewall Jackson get his nickname?

During the fighting on Henry Hill, Brigadier General Barnard Bee rallied his men by pointing to Jackson's brigade standing firm like a stone wall. Bee was killed soon after, but the name stayed with Jackson and his brigade.

How many soldiers were killed or wounded at Bull Run?

Estimates differ. The National Park Service gives about 4,700 casualties in all, 2,950 Union and 1,750 Confederate. The American Battlefield Trust gives 2,896 Union and 1,982 Confederate. These figures include killed, wounded, missing and captured.

Notes

A number in the text points to a note; each note names the works that paragraph draws on, listed in full under Sources.

  1. American Battlefield Trust, “Bull Run”; National Park Service, “The Battle of First Manassas (First Bull Run)”. ↩
  2. National Park Service, “The Battle of First Manassas (First Bull Run)”; National Park Service, “Battle Summary”; American Battlefield Trust, “Bull Run”. ↩
  3. American Battlefield Trust, “Bull Run”; National Park Service, “The Battle of First Manassas (First Bull Run)”; National Park Service, “Battle Summary”. ↩
  4. American Battlefield Trust, “Bull Run”; National Park Service, “The Battle of First Manassas (First Bull Run)”; National Park Service, “Battle Summary”. ↩
  5. American Battlefield Trust, “Bull Run”; National Park Service, “The Battle of First Manassas (First Bull Run)”; National Park Service, “Battle Summary”. ↩
  6. National Park Service, “Battle Summary”; American Battlefield Trust, “Bull Run”. ↩
  7. National Park Service, “Battle Summary”; American Battlefield Trust, “Bull Run”. ↩

Sources

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